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cho tam giac abc co goc b-c=20do.tia phan giac cua goc a cat bc tai d.tinh goc adb va adc
Cho tam giac ABC co goc B - goc C = 20 do. tia phân giac cua goc A cat BC tai D. Tính goc ADB va goc ADC ?
cho tam giac ABC co goc B = 80 do, goc C =30 do . tia phan giac cua goc A cat BC o D . tinh doc ADC, goc ADB
cho tam giac abc vuong tai a co goc b bang 60 do tren canh bc lay diem h sao cho hb=ab duong vuong goc voi bc tai h cat ac tai d
a/ cm bd la tia phan giac cua goc adc
b/ chung to tam giac bdc can
cho tam giac ABC co B-C=a, tia phan giac cua goc A cat CB tai D. Cau a : tinh ADC,ADB . Cau b: ve AH vuong goc voi BC, tinh HAD
Cho tam giac ABC co goc B=75do, goc C= 45 do, tren canh BC layD sao cho gocBAD=45 do, duong vuong goc voi DC tai C cat tia phan giac cua goc ADC tai E.Tinh goc CBE
Ai thong minh giup minh voi minh can gap lam
cho tam giac abc co goc b = goc c, tia phan giac cua goc a cat bc tai d
1. chung minh tam giac adb = tam giac adc
2. chung minh ad vuong goc voi bc
3. tren tia doi cua tia da lay diem m sao cho da = dm, chung minh ab // cm
cho tam giac ABC co A=60 cac tia phan giac cua goc B va C cat nhau tai I,cat cac canh AC,AB lan luot tai D vaE tia phan gia cua goc BIC cat BC o F tinh goc BIC
cho tam giac aBC vuong tai A co goc B=30 do, AB=6cm,Tia phan giac goc C cat AB tai D.Tinh AB va BD